Behavior of magmatic components in fumarolic gases related to the 2018 phreatic eruption at Ebinokogen Ioyama volcano, Kirishima Volcanic Group, Kyushu, Japan

Ohba, Takeshi; Yaguchi, Muga; Tsunogai, Urumu; Ito, Masanori; Shingubara, Ryo

doi:10.1186/s40623-021-01405-4

Earth, Planets and Space

Table 1 Concentration of chemical species in fumarolic gases and isotopic ratio of H₂O and H₂ with their corresponding apparent equilibrium temperatures (AETS and AETD). The unit of concentration is in micro-mol/mol (= ppm)

From: Behavior of magmatic components in fumarolic gases related to the 2018 phreatic eruption at Ebinokogen Ioyama volcano, Kirishima Volcanic Group, Kyushu, Japan

Location	Date, mm/dd/yyyy	Temp, ℃	H₂O	CO₂	H₂S	SO₂	He	H₂	O₂	N₂	CH₄	Ar	H₂O, δD_SMOW ‰	H₂O, δ¹⁸O_SMOW ‰	H₂, δD_SMOW ‰	AETS, ℃	AETD, ℃
a	12/22/2015	97.2	984,285	14,163	1192	26.8	0.209	1.73	0.145	328	0.401	2.65	− 91	− 14.1	− 400	232	385
a	2/24/2016	97.2	982,088	16,532	1037	84.7	0.232	7.40	0.091	250	0.211	1.09	− 52	− 6.3	− 229	313	726
a	5/6/2016	95.3	978,065	20,210	1459	58.5	0.192	4.30	0.050	201	0.206	1.91	− 57	− 6.6	− 348	277	437
a	8/30/2016	96.9	982,596	14,237	2977	48.9	0.122	8.77	0.093	131	0.165	0.47	− 41	− 5.3	− 464	296	252
a	1/17/2017	96.4	991,615	6493	1756	67.3	0.043	15.4	0.022	53	0.060	0.21	− 43	− 3.6	− 284	338	549
a	5/15/2017	96.5	988,363	6601	2177	2303	0.055	468	0.000	89	0.088	0.26	− 42	− 2.2	− 173	752	926
a	9/15/2017	106.0	991,168	5444	3077	215	0.055	24.1	0.012	71	0.077	0.42	− 48	− 3.7	− 354	376	416
a	10/18/2017	96.0	989,645	8683	1418	149	0.070	20.4	0.475	84	0.055	0.35	− 48	− 3.5	− 204	374	804
a	11/28/2017	95.9	990,814	6954	1965	103	0.080	49.1	0.044	114	0.076	0.49	− 49	− 3.7	− 436	416	292
a	1/26/2018	96.8	988,768	7798	3227	77.5	0.076	27.2	0.075	102	0.045	0.55	− 48	− 3.7	− 141	361	1152
a	3/28/2018	96.2	984,731	9104	2993	2901	0.098	166	0.369	104	0.064	0.36	− 46	− 2.2	− 120	611	1310
a	5/29/2018	96.7	996,200	2867	367	421	0.026	110	0.048	34	0.020	0.21	− 45	− 2.4	− 141	571	1127
a	10/19/2018	95.6	983,165	15,786	822	42.2	0.127	22.6	0.070	162	0.122	0.62	− 69	− 8.1	− 385	366	385
a	1/25/2019	96.1	994,356	4894	508	103	0.038	19.6	2.97	115	0.046	1.02	− 64	− 6.7	− 402	385	353
a	5/31/2019	96.0	993,015	5915	850	28.9	0.077	8.45	0.110	181	0.034	1.50	− 84	− 11.7	− 471	305	272
a	11/8/2019	94.1	943,027	9299	1276	419	0.267	11.1	1187	44,213	−	568	− 93	− 14.6	− 565	363	171
a	2/14/2020	93.6	735,078	43,125	10,430	889	0.924	24.7	29,985	177,916	−	2552	− 89	− 14.3	− 484	400	261
a	7/31/2020	88.1	–	–	–	–	–	–	–	–	–	–	− 94	− 15.9	–	–	–
b	2/24/2016	96.2	982,869	15,845	960	42.5	0.217	7.04	0.155	275	0.183	1.58	− 78	− 11.9	− 242	301	756
b	5/6/2016	95.2	973,056	24,918	1717	50.6	0.239	5.48	0.092	251	0.261	1.92	− 67	− 9.2	− 355	283	437
b	8/30/2016	95.2	974,618	20,773	4329	55.0	0.191	13.8	0.116	210	0.277	0.82	− 56	− 7.5	− 468	314	256
b	1/17/2017	97.0	992,873	5462	1596	18.8	0.040	4.24	0.040	46	0.054	0.17	− 46	− 4.6	− 611	258	110
b	5/15/2017	96.6	989,119	7887	1575	680	0.103	603	0.000	135	0.157	0.34	− 46	− 4.0	− 399	745	340
b	9/15/2017	96.4	993,226	4017	2622	42.6	0.046	27.0	0.052	65	0.074	0.37	− 44	− 1.9	− 457	353	262
b	10/18/2017	96.0	990,369	8208	1270	45.3	0.076	18.4	0.066	89	0.044	0.31	− 45	− 2.6	− 199	347	817
b	11/28/2017	96.0	985,348	11,939	2455	32.6	0.130	44.5	0.076	179	0.106	0.84	− 47	− 3.4	− 506	380	208
b	1/26/2018	96.4	990,910	6373	2588	8.3	0.073	16.6	0.059	103	0.049	0.59	− 44	− 1.9	− 271	300	584
b	3/28/2018	97.7	992,249	6145	565	863	0.070	107	0.056	70	0.072	0.21	− 40	− 1.3	− 178	579	891
b	10/19/2018	96.8	984,067	15,061	655	56.1	0.118	17.7	0.328	143	0.109	0.47	− 51	− 3.8	− 430	361	301
b	1/25/2019	95.0	992,940	6279	540	146	0.049	23.5	0.166	70	0.045	0.31	− 46	− 2.6	− 391	403	352
b	5/31/2019	96.0	994,446	4735	653	29.0	0.059	5.81	0.034	130	0.046	0.96	− 60	− 6.0	− 446	291	288
b	2/14/2020	95.8	991,959	7136	754	56.9	0.059	7.73	0.179	85	0.066	0.39	− 78	− 11.2	− 398	314	373
c	5/15/2017	95.2	990,014	7988	1078	367	0.114	416	0.000	135	0.140	0.42	− 57	− 6.8	− 321	681	490
c	9/15/2017	96.1	994,811	2997	2105	15.2	0.042	11.42	0.019	59	0.066	0.37	− 44	− 2.7	− 426	295	301
c	10/18/2017	96.2	989,576	8984	1305	19.8	0.075	3.14	0.026	111	0.057	0.67	− 48	− 3.7	− 469	250	250
c	11/28/2017	95.8	985,615	11,639	2511	39.7	0.132	5.16	0.076	189	0.144	0.90	− 51	− 4.5	− 586	271	133
c	1/26/2018	95.7	990,153	7152	2557	19.6	0.079	4.52	0.063	113	0.039	0.64	− 44	− 2.7	− 534	255	178
c	3/28/2018	97.0	991,404	7370	609	420	0.081	108	0.139	89	0.101	0.32	− 46	− 3.3	− 239	552	677
c	5/29/2018	96.1	990,254	8215	1367	41.4	0.062	16.0	0.034	105	0.069	0.98	− 50	− 4.1	− 433	336	296
c	10/19/2018	94.8	944,418	52,031	2874	18.3	0.545	3.23	0.380	649	0.674	3.59	− 73	− 10.3	− 626	241	107
c	1/25/2019	97.6	973,434	23,782	2555	17.3	0.164	3.52	0.103	206	0.248	1.22	− 65	− 8.5	− 613	244	115
c	5/31/2019	94.7	984,364	12,479	2840	23.9	0.169	5.46	0.035	284	0.307	2.90	− 80	− 12.7	− 615	264	118
c	11/8/2019	94.0	732,980	160,775	19,146	251	1.53	21.2	14,915	71,048	3.41	859	− 93	− 16.0	− 627	353	112
c	2/14/2020	93.5	861,783	128,932	6955	69.8	1.81	6.71	2.32	2240	1.65	7.54	− 82	− 13.9	− 635	282	102
c	7/31/2020	85.9	422,263	542,741	24,290	201	5.44	13.2	32.6	10,337	8.66	108	− 99	− 18.0	− 653	348	92
h	7/31/2020	95.9	995,551	3785	183	357	0.034	6.20	8.08	109	0.00	0.98	− 78	− 14.2	− 346	360	471

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